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SPMB REGIONAL I KODE 480 TAHUN 2005 Dua benda A dan B bermassa sama masing masing 2 kg saling bertumbukan. Kecepatan sebelum tumbukan adalah v A = 15i + 30j (m/s) dan v B = -10i + 5j (m/s). Kecepatan benda A setelah tumbukan adalah -5i + 20j (m/s) persentase energi kinetik yang hilang secara tumbukan adalah ….

SPMB REGIONAL I KODE 480 TAHUN 2005

Dua benda A dan B bermassa sama masing masing 2 kg saling bertumbukan. Kecepatan sebelum tumbukan adalah vA = 15i + 30j (m/s) dan vB = -10i + 5j (m/s). Kecepatan benda A setelah tumbukan adalah -5i + 20j (m/s) persentase energi kinetik yang hilang secara tumbukan adalah ….

  1. 10%

  2. 20%

  3. 40%

  4. 60%

  5. 80%

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Y. Maghfirah

Master Teacher

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E n e r g i space k i n e t i k space s e b e l u m space t u m b u k a n space colon EK subscript straight A equals 1 half straight m. straight v subscript straight A superscript 2 EK subscript straight A equals 1 half open parentheses 2 close parentheses open parentheses 15 squared plus 30 squared close parentheses rightwards arrow EK subscript straight A equals 1125 straight space straight J EK subscript straight B equals 1 half straight m. straight v subscript straight B superscript 2 EK subscript straight B equals 1 half open parentheses 2 close parentheses open parentheses 10 squared plus 5 squared close parentheses rightwards arrow EK subscript straight B equals 125 straight space straight J EK subscript 0 equals EK subscript straight A plus EK subscript straight B EK subscript 0 equals 1125 plus 125 rightwards arrow EK subscript 0 equals 1250 straight space straight J  Dari space hukum space Kekekalan space Momentum space didapatkan space kecepatan space akhir space benda space setelah space tumbukan space adalah space colon straight m subscript straight A. straight v subscript straight A plus straight m subscript straight B. straight v subscript straight B equals straight m subscript straight A. straight v subscript straight A superscript straight apostrophe plus straight m subscript straight B. straight v subscript straight B superscript straight apostrophe  Karena space straight m subscript straight A space equals space straight m subscript straight B space equals space 2 space kg comma space maka space bisa space dibagi space pada space kedua space ruas straight v subscript straight A plus straight v subscript straight B equals straight v subscript straight A superscript straight apostrophe plus straight v subscript straight B superscript straight apostrophe open parentheses 15 straight i plus 30 straight j close parentheses plus open parentheses negative 10 straight i plus 5 straight j close parentheses equals open parentheses negative 5 straight i plus 20 straight j close parentheses plus straight v subscript straight B superscript straight apostrophe 5 straight i plus 35 straight j equals open parentheses negative 5 straight i plus 20 straight j close parentheses plus straight v subscript straight B superscript straight apostrophe straight v subscript straight B superscript straight apostrophe equals open parentheses 10 straight i plus 15 straight j close parentheses straight space straight m divided by straight s  Energi space kinetik space setelah space tumbukan space colon EK subscript straight A superscript straight apostrophe equals 1 half straight m open parentheses straight v subscript straight A superscript straight apostrophe close parentheses squared EK subscript straight A superscript straight apostrophe equals 1 half open parentheses 2 close parentheses open parentheses 5 squared plus 20 squared close parentheses rightwards arrow EK subscript straight A straight apostrophe equals 425 straight space straight J EK subscript straight B superscript straight apostrophe equals 1 half straight m open parentheses straight v subscript straight B superscript straight apostrophe close parentheses squared EK subscript straight B superscript straight apostrophe equals 1 half open parentheses 2 close parentheses open parentheses 10 squared plus 15 squared close parentheses rightwards arrow EK subscript straight B straight apostrophe equals 325 straight space straight J EK to the power of straight apostrophe equals EK subscript straight A superscript straight apostrophe plus EK subscript straight B superscript straight apostrophe EK to the power of straight apostrophe equals 425 plus 325 rightwards arrow EK straight apostrophe equals 750 straight space straight J  Sehingga comma space persentase space energi space kinetik space yang space hilang space adalah space colon straight percent sign increment EK equals fraction numerator left parenthesis EK subscript 0 minus EK straight apostrophe right parenthesis over denominator EK subscript 0 end fraction cross times 100 straight percent sign straight percent sign increment EK equals fraction numerator open parentheses 1250 minus 750 close parentheses over denominator 1250 end fraction cross times 100 straight percent sign straight percent sign increment EK equals 500 over 1250 cross times 100 straight percent sign rightwards arrow straight percent sign increment EK equals 40 straight percent sign

 

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